REMOVE

1. Rock art.
2. Photographs
3. Glass negatives

WHAT

1. Glass negatives (1)
2. Rock art. (1)
3. negative (1)

WHO

1. Genthe, Arnold (1)
2. Library of Congress Print … (1)

WHEN

1. 1869-1942 (1)
2. 1899 (1)
3. 1928 (1)
4. between 1899 and 1928 (1)